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the Titan is your signing mechanism. you have to have *something* connected to the internet & the blockchain in order to make a transaction. this is where the app comes in.
the app sets up the transaction, the titan signs it, and then the app pushes the transaction to the blockchain.
the Titan is air-gapped. this means you have robust security when it comes to signing transactions.
in the event someone tries to put a key-logger on your laptop, for example, the air-gapped QR Code mechanism keeps the hacker from capturing your signing password. thus, it’s more secure.